Fibrous filtering-film



INVENTOR ATTORNEY-5 lll/ll.

C. H. VAN NOSTRAND'AND H. E. SCHULSE.

FIBROUS FILTERING FILM.

APPLICATION FILED MAY 28, IQIs.

Patented Aug. 30, 1921.

UNITED STATES PATENT OFFICE.

CHARLES H. VAN NOSTRAND, .OF ORANGE, ANlD HERMAN E. SCHULSE, 0F JERSEYCITY, NEW JERSEY; SAID SCHULSE ASSIGNOR TO SAID VAN NOSTRAND.

. y FiBRoUs FILTERING-FILM.

' Application filed May 28,

To all "Lo/0m t may concern.'

Be it known that` we, CHARLES H. VAN Nos'rRAND and HERMAN' E. SoHULsn,citizens of the United States, the former a resident of Orange, Essexcounty, State of New Jersey, and the latter a resident of Jersey City,Hudson county, State of New Jersey, have invented certain new and usefulimprovements in Fibrous Filtering-Films, of which the following is aspecification.

Our invention relates to filtering films made of fibrous filteringmaterial. It has Y for its object to produce new and improved filteringfilms made of fibrous material, light in construction and suitablein'shape to be removable and replaceable in connection with suitablesupporting` devices', and presenting a minimum of joints and clampingmeans at such joints, and giving relatively large and efficientfiltering surface, and possessing other advantages herein recited.

It consists of the new and improved filtering films herein shown anddescribed.

ln the drawings accompanying the specification we show ourimprovement inits preferred form. Referring to such drawings, Figures 1, 2 and 3 arelongitudinal sections through our improved filtering film, Fig. 1 beingalso through the innerand outer perforated plates, Fig. 2 showing thefilm slightly thickened at its base, and F ig. 3 showing` the filmslightly thickened at its base, and Fig. 8 showing the supportingperforated plates as inclined slightly outward at their bases. Fig. 4shows a modified form of the base of the supporting' plates.

Our improved film is made tapering in form, preferably closed at theapex andopen at the base, and is made of any light fibrous filteringmaterial, such as sheet asbestos, preferably of substantially the samethickness, texture and density throughout. It may be made by means ofany suitable ap'- paratus and any suitable process, as, for instance, bythe apparatus and process shown in our pending` applications No. 216,110and No. 216,111, of which latter case this application is a division. Inpractice we prefer to make it from asbestos which has been treated `soas to make a sheet of compressed asbestos of the same thickness, textureand density throughout the sheet. It is then made into the desired formin-any suitable way.

In the drawings l represents the finished 'Specification of' LettersPatent. 1 Patented Aug. 30, 1921,

191s. serial No. 236,995.

film. As shown itis slightly tapering with a rounded and closed apex 2,andhaving only one opening, namely, at the base 3. Thel iceable for usein connection with perfoc rated inner and outer supports ofsubstantially the' same shape. 4L illustrates an outer perforatedsupport and 5 an inner perforated support. The latter is preferablyprovided with an imperforate rounded apex 6. Our improved film is nestedbetween an inner and outer perforated support. At the apex there is nojoint due to the imperforate cap or apex ofthe inner support, so thatonly one joint remains to be clamped, namely, at the baseer opening ofthe filtering supports and film. The slightly tapering shape of the filmand its supports enables a tight joint to be made at this point betweenthem by merely slipping one over the'other.

rThe film shown in l? ig. 2 is thickened at its ing thejoint at the basebetween the film vand its supports. ln F ig. 3 the supports 4 and 5 areshown as slightly inclined outward. This is to further assist intightening the joint. In Fig, 4 the. inner perforated sup- `port5 isshown as provided with a bead as shown at VSi. The .film is compressedbetween the head and the outer support.

It will be understood of course that many changes or modifications maybe made without departing` from our invention, the essentials of whichare set forth in the appended claims.

What we claim as new and desire to secure by Letters Patent is:

1. As an article of manufacture, a filtering film section composed of afiltering film tapering in form, made of fibrous filtering materialcompressed so as to be of even porosity throughout, and an outer andinner perforated support of the same tapering form, the film and its twosupports adapted to nest upon one another to form a tight joint at thebase.

2. As an article of manufacture, a filtering ihn section Composed of altering film tapering in forni, made of ibrous filtering Inaterialcompressed so as to he of even porosity throughout, and with a closedapeX and open base, and an outer and an inner perforatedsupportsimilarly tapering in form, and each solid at its apex and openat its base, the hn being` adapted to he nestedbetween the two supports,and the iilni and its supports when thus nested and forced togtheradapted to form a tight joint at their base,

3. As an article of manufacture, a iltering section composed of afiltering rm, tapering in forni, closed at its apex and open terialcompressed so as to be of the same porosity throughout, and an outer andinner perforated support similarly tapering and closed at their apexesand open at their bases and Haring slightly outward at their bases, thefilm being adapted to nest between the supports and the three, whennested and pressed together adapted to form a tight joint at the base.

In testimony whereof, we have signed our naines to this specification.

CHARLES H. VAN NOSTRAND. HERMAN E.' scHULsE.

at its base, and made of fibrous filtering ma- '15

